Compositions – Leather or fur treating
Patent
1978-08-30
1984-05-15
Barr, Josephine
Compositions
Leather or fur treating
166274, 166275, C09K 300
Patent
active
044486987
ABSTRACT:
In the displacement of crude oil through a subterranean reservoir with an aqueous displacement fluid, improved oil recovery is obtained by providing a salinity contrast between the displacement fluid and aqueous formation fluid. The salinity of the displacement fluid is selected such that at least one mixture of the aqueous displacement and the aqueous formation fluid will have the minimum interfacial tension between the displaced crude oil and mixtures of these fluids. The minimum interfacial tension between crude oil and mixtures of aqueous displacement and formation fluids can be determined by mixing these fluids such that some mixtures contain from essentially none to essentially all displacement fluid and determining the interfacial tension between the mixtures and the crude oil. The displacement fluid is a micellar fluid followed by a polymer-containing aqueous fluid. Further improvements in oil recovery are obtained when this salinity contrast is provided and the salinity of the polymer-containing fluid is less than the salinity of the mixture which provides the minimum interfacial tension with the crude oil.
REFERENCES:
patent: 3480080 (1969-11-01), Murphy
patent: 4258789 (1981-03-01), Hedges et al.
patent: 4330418 (1982-05-01), Glinsmann et al.
Barr Josephine
Brown Scott H.
Hook Fred E.
Standard Oil Company
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